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Chapter 42 Layer 2 Protocol Tunneling
XGS2220 Series User’s Guide
301
CHAPTER 42
Layer 2 Protocol Tunneling
42.1 Layer 2 Protocol Tunneling Overview
This chapter shows you how to configure layer 2 protocol tunneling on the Switch.
42.1.1 What You Can Do
Use the Layer 2 Protocol Tunneling screen (Section 42.2 on page 302) to enable layer 2 protocol
tunneling on the Switch and specify a MAC address with which the Switch uses to encapsulate the layer
2 protocol packets by replacing the destination MAC address in the packets.
42.1.2 What You Need to Know
Layer 2 protocol tunneling (L2PT) is used on the service provider's edge devices.
L2PT allows edge switches (1 and 2 in the following figure) to tunnel layer 2 STP (Spanning Tree Protocol),
CDP (Cisco Discovery Protocol) and VTP (VLAN Trunking Protocol) packets between customer switches
(A, B and C in the following figure) connected through the service provider’s network. The edge switch
encapsulates layer 2 protocol packets with a specific MAC address before sending them across the
service provider’s network to other edge switches.
Figure 224 Layer 2 Protocol Tunneling Network Scenario
In the following example, if you enable L2PT for STP, you can have switches A, B, C and D in the same
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